Nitrogen abundance estimates (triangles) and upper limits (arrows) assuming no secondary flux contribution are plotted against effective-temperature estimates for our binary sample (black symbols). The representative error bars are for targets listed in Table 3, with those for targets from Table 4 being larger – see text for details. Also shown are the single-star sample discussed in Sect. 4.4.2 (red symbols – some targets have been moved slightly in effective temperature in order to improve clarity). The dotted line represents a baseline LMC abundance of 6.9 dex. The solid lines are evolutionary models from Brott et al. (2011a) with initial masses of 8, 10 and 12 M_⊙ and an initial equatorial rotational velocity of approximately 230 km s^-1.